linux-kernel - Re: [PATCH v6 2/3] Makefile: infer --target from ARCH for CC=clang

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Message-ID: <CANiq72ng4a1g8TDFWb652TNhch2NDrQsHkJyP5HrrkJREGg8jg@mail.gmail.com>
Date:   Thu, 5 Aug 2021 20:17:40 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Arnd Bergmann <arnd@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christoph Hellwig <hch@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v6 2/3] Makefile: infer --target from ARCH for CC=clang

On Mon, Aug 2, 2021 at 8:39 PM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
>
> We get constant feedback that the command line invocation of make is too
> long when compiling with LLVM. CROSS_COMPILE is helpful when a toolchain
> has a prefix of the target triple, or is an absolute path outside of
> $PATH.
>
> Since a Clang binary is generally multi-targeted, we can infer a given
> target from SRCARCH/ARCH.  If CROSS_COMPILE is not set, simply set
> --target= for CLANG_FLAGS, KBUILD_CFLAGS, and KBUILD_AFLAGS based on
> $SRCARCH.
>
> Previously, we'd cross compile via:
> $ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make LLVM=1 LLVM_IAS=1
> Now:
> $ ARCH=arm64 make LLVM=1 LLVM_IAS=1
>
> For native builds (not involving cross compilation) we now explicitly
> specify a target triple rather than rely on the implicit host triple.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1399
> Suggested-by: Arnd Bergmann <arnd@...nel.org>
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Suggested-by: Nathan Chancellor <nathan@...nel.org>
> Acked-by: Arnd Bergmann <arnd@...nel.org>
> Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Acked-by: Miguel Ojeda <ojeda@...nel.org>

Cheers,
Miguel